Spray gun



v May 6, 1930.

J. c. HULL 1,757,195

SPRAY GUN- Filed Feb. 18, 1927 INVENTOR.

ATTORNEYS v r UNITE-D;

' 5 provide a nozzle structure of sturdy. design that a..rotary movement of the valve b dy 5 Other objects and advantages of the informedas is clearly shown to correspond with 3 2-2 ofFigure l,

Patented May 1930 V r a i .;2; it i I 7' fhpplication filedelebruary 18,1927; seriarm. 169,351. I l This invention relates-to a spray gun conthreads 7. Coo erating with'thethreads "7 V struction and more particularly to the nozzile ofthe valve body .is-a corresponding set of 7 portion of such a'construction. internal threads 8; provided on the inner sur The primary object of the invention is' to facefof lieno'zzle'body. It is thus apparent and construction and which will afford an byfmeans'oi" hevalve stem9 effects 'a longiaccurate and minute control of boththe quan-' tudi al movement of the valve body in op tity-and character of a stream ofrflui d tofbe posite' directionsfdepending upon the direc-; projected therethrouglr, tionpfrotationofthe valve. stem. Formed Furtherobjects relate to the arrangement integrallywith the valve body is a' reduced and relative disposition of the parts affording vealveportion 11 which is'adaptedto cooper.- convenient assembly; and disasseinbly. and atewith the adjacent endof a tubular elbow 7 ready access for purposes of inspection, remember 12fitted within the outer end ofthe pair or replacement. nozzle body. The'tubular valve member is vention will appear in connection with the the angularit'yof the twoportions. ofthe nozfollowing detailed description of the specific 'zle body; This tubular valve member is pro structural embodiment chosen for illustrag vided withfa'disk portion at one end having a 20 tion in the drawings. j v r U 1 A i plurality,ofgapertures 13 disposedtherein. H Figure l is alongitudinal section-through Theva'lve body 6 is provided with a plurality a spray gun embodying my invention, offlongitudinally disposed "grooves 15 pass- V Figure 2 is a verticalsectiontaken on line ing; through 'andinterrupting the threads 7 on its periphery; The valve body 6'also has Figure 3 is, a vertical section'taken online .formed thereon a conicalportion ,6" adapte 7 83 of Figure 1, and I V to cooperate with avalve, seat '14, wh ch seat Fi 4 1 ti al ti n on li 4-4; is injthe form ofaring forced orother'wise f Figure 1. ,1i Secured w thin the'bOdy Q, V 'The nozzle structure in whichiny inven V From t fii for g i g s ip i o t tion isincorporated may be employed with str ture Of, myinven i i hould be 31 1 1 any suitable form of pressure chamber, such ex t-that the compressed'fluid witliin'the presfor example as the pressure rcylinderilfl as sure hamber 1 has at, all times a free-passhown in the drawings. The nozzle may sage through the longitudinal passageways have a threaded connection withthe end of 1 5thevalvebody'dinto the vicinity of the thepressure: cylinder ormaybefwjelded-or adjustablevalve-mechanisms Theifluid so otherwise secured thereto as desired. The passing through'ethe 'passages 15' may reach nozzle bodyindicated at 2 in the drawings thefdis'charge portfltof the nozzle cap by is in the present form of the invention shown. either, fofjtwoj dljflerent paths variable as being of elbow formation. Certain ad flow offluidinay bebyrpassedlfroundtheel I vantages ar se rea'sonIof-the discharge end bowineinber :12, thru apertures "13' and into of the nozzlebody extending. atfan angle to theconi'caldischarge chamberzv5e,',by suitably the longitudinal axis of the spray gun, such adjusting the yalve'stemfiandefiecting there-V for example as convenience in themanipulaby a variable op ening or closing of valve ma tion and use offsuch a gun-inclose, quarters. bers- 6f, and 'll'.jiFluid' nayalsopass inyary- The discharge end of the nozzle body 2 is ing quantitiesthrough the, tubular valve eleprovided with a cap. 3, having a conical disnient 12 andinto'the conical discharge chain'- charge chamber 5, and a discharge portA reg: berv 5 dependinguponthe position of thevalve iste-ring with the'said chamber; 1-,. i memberflL; p V. i. 1. My-improved valve mechanism: .whichyis TA nozzle constructed as described aboveaf-l disposed within the nozzle body comprissa forest very accurate control ,of--both ,,,the

valve body 6 provlded"withfefierhalscrew 'rquantity and character of *fluidi'to be pro-- jccted therethrough by reason of the two separate and variable passages for the fluid.

nozzle construction;

It is apparent that if the valve members 11 and 12 be in close position the fluid can pass only around the tubular valve member 12 through valve 6., and apertures 13. If, however,the valve member 11 is adjusted to permit passage of'fiuids. through thetubular valve element/12', it'is'appar'ent that the c'haracter of thestreampassing around member 12 will be modified in proportion to the ex- By'imposin tent of opening'of the valve; this variable flowof fluid under .pressure thefirst mentioned variable flow it is possible to obtain a. very wide 'ran ge' of' changesin the character andquantity the stream pro-f jGCtB' Ci. I j ,i I desire to, emphasize the importanceof the two simultaneously adjustable, but independent feeds which characterize my'iinproved The fluids-passed thru valve member l4 as contrdlled by the 'com-.

' plemental conical valve' memberfifassumes' ferentdepths'; 1 The feed conical a rotational "or swirling conditionflin the passing between the threads 7' an'd 8-of'Edifgoverned by valve member 11 and passing. thru elbow member 12 is a center 'feedfas distinguished from the circumferential feed around the elbow member. The center feed serves to confuse the robing .1 swirli g feed and thiisaffords a discharge ofwidely variable characteristics. twill be observed hat the movementof valveody 6 rearward 1y of the nozzle effects first a variable sepa-' ration of valve members 6 and 1A while main taining valve members 11, tion. This adjustment oroduces the variable circumferential feed, but jupon continued rearward movement of the; valve body, the valve members 11,12are opened thus imposing; the variable directcenfter feed'upon' the ward position".

circun fer'ential feed. It is, of course, apparen at a" Comple e ut-01 t btained by screwing. the alve body I Thearrangement the partsj'coniprising the pre en chment} Qt .jlny ve ion s 7 uch as to afi rd :a con e ient assembly and di ssemb y of pa s; The v l e (body 6 is pinned .to the valve stem .9 may e read ly.

removed ther w h longitiidinally' of th spray gun- By remo ing: t e threa'ded dis.- charge cap .3 accessina'y he had to he tubular. alve element. Wh emovedTand repaired, for 1 repl ed: .Ih s

h-may henhe readily parts. const t 'tc the i yfigunn zzle and i is a arentthat theleiisjljitt e likelihood of failure'hy r ason of breakag ior. isplacement otthe'pa ts-" ..I.,j .1 It should be clearly. understood thatldiff feat. fox-1 .91 nozzl c ps can? beintercha g a ly emp y d in: pla e the spirit of the invention theretoga.frotatahle 1 i i la n za isf o p surface thereof and discharge chamber 5, by'virtuefofit fluid of the circumferential 12 in. closedljposi:

toiit's cgitreme foron the valvemember', s: ing a v plurality oflo slots formedinthe surface thereof and of a of the cap 3 a herein.

mamas i ay employ ventional capcontainin'g a flat apertured detachable. disk and gasket, when'thegun is to beemploycd for orchard work and the like.

While I have shown but a single specific embodimentof my invention I do not wish to be understood as limiting invention toall the I structural details of such embodiment but infied in various ways without departing from as defined in the appended elaims,

lVhatI claim is 9 V L In a spray gun, the combination with i a pressure chamber, a nozzle body secured valve spindle disposed within said pressure an exte al y crewtlire'ajded valvemember secured to said spin? (he, a valve seattherefor," screw threads' on the. interior of said nozzle body and .coactsaid valve. member having a plurality of tend. that many of the details' may bemodiham and ex end g longitudinally P O formed inth'e of a depth greater than that of said screwthreads,a cap secured to j the .outer "end of h I said nozzle body and having a discharge aperture therein, .a tubular conduit disposed intermediate said cap and valvebody and communicating-with said charge'aperturc and form ngwithsaid nozzle y bY-P with said discharge body for controlling'the flow ofjfluid through threaded valve member secured to said spindl.e, scr ew threads on the'interior ofv said nozzl ba ly a s ac mg w h t e thr ad iid valve memberhavr ng tiid ial y d pos depth greater. than that ef said screw threads, a eap' secured to the outer end of b dy-an h ngad ha g ap rtur t ere in a tubular conduit disposed intermediate "said cap andvalve body and in spaced rela 7 tion tothe inner annular of said nozzle o a m 'by-Pas f oun aid.

bo y w re y conduit, a membersecured insaid. nozzle. dy 1 a mil e th C nduit. and, v l e member nd h v ng avalve opening. in

I es around said conduit which is 7 also In communication I aperture, and meansiformed onsaid valve w said nozzle c mmunic t on th said ypess, amln a ls 1 formed on sa d valve membe and adap ed. o caai twith. aidswa uitandJwit sai seat for controlling the flow of said cond it and by-pass, valrsm mh a ed to ingest Conduit in ..;gagen nt;with aaid-xialveseat-Q ind hrough 7 s ing with th'e threadsfon thevalve member,

8. In a spray gun, the combination with a pressure chamber, a nozzle body secured thereto, a rotatable spindle disposed Within said pressure chamber and extending into 1 said nozzle body, an externally threaded valve member secured to said spindle, a .cap'

' secured to the outer end of said nozzle body and having a discharge aperture therein, a

tubular conduit disposed intermediate said cap and valvebody and in spaced relation whereby to form a bypass aroundsaid conduit, a member secured in said nozzle body intermediate the conduit and valve member and having a valve seat opening in com-V munication with said by-pass, said valve member havlng a conical portion and a cylindrical portion for coaction with said valve seat and, conduit respectivelyfor controlling the flow of fluid therethrough, said valve member arranged to engage said conduit in engagement Wlt-l'l said valve 1 advance of its seat. g

4;. In a spray gun, the combination With a pressure chamber, a nozzle body secured thereto, a rotatable spindle disposed-Within said pressure chamber, and extending into said nozzle body, an externally threaded valve member secured to said spindle,-a cap secured to the outer end of said nozzle body and having adischarge aperture therein, a

tubular conduit disposed intermediate said cap and valve bodyand in spaced relation to the inner annular all of saidnozzle body whereby to form a by-pass around said con'-.v

duit, a member secured in said nozzle body intermediate the conduit and valve member and having a valve seat opening incommuni- Y cation with said by-pass, said valve member having an end portion of substantially cylindrical form for coaction with said conduit and an mtermedrate portion of substantially conical form for coaction vvith; said valve seat, said valve member arranged to engage saidconduit in advance of its engagement with said valve seat.

' 5. A nozzle comprising a hollow body of elbow form, an apertured capsecured to the end of said body, a tubular conduit of elbow form disposed Within said body adjacent said cap and beingof less external diameter than the bore of said hollow body to provide a bv-passaround said conduit, a valve seat formed in said body inwardly of the inner end of said' conduit and a valve member having surfaces for coaction with said valve seat and conduitto seal the same, said valve member arranged to engagesaid conduit 1nadvauce of its engagement Wltl'lSfLldVfLlVG seat. In testimony whereof I affix mysignature.

JOHN G. HULL. 

